Photos and video from Yellowstone National Park made on May 18, 2012, including sandhill crane, yellow-bellied marmot, and the trio of the famous "Quad Mom" grizzly bear who had four cubs two springs ago. Two of those four cubs have survived to this, their third and final spring with mom. Soon she'll be sending them off to make their own way in the world. The two of them might stick together for awhile, but the time remaining for the trio is short.